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Molecular dynamics simulation combined magnetic theory on investigation of the magnetic properties and nano-structural variation of Co-Cu nanoparticle.

The Co-Cu nanoparticles is one of the magnetic materials that have considerable potential for a variety of industrial applications, including giant magnetoresistance (GMR) digital storage devices and have therefore attracted a great deal of attention in recent years. For this reason, it will be an important reference to the development of the magnetic digital storage devices if we can go deep into study the material properties of the Co-Cu nanoparticles.
This study uses molecular dynamics simulations to investigate the crystalline process of Co-Cu nanoparticles of high and low Co concentrations (5~25 %) during the annealing process. The modified many-body tight binding potential is adopted to accurately model the Cu-Cu, Co-Co, and Co-Cu pair inter-atomic interactions. The structural transformations at the upper and lower melting points are observed by the radial distribution function (RDF), the angle correction function (ACF) and the average bond lengths. finally, we employs molecular dynamics simulations to predict the distribution function of diluted magnetic Co atoms in a Cu host and then uses the the Ruderman-Kittel-Kasuya-Yosida (RKKY) theory and quantum magnetism theory to calculate the magnetic properties of the Co-Cu alloys at different temperature, including their Curie temperature.

Identiferoai:union.ndltd.org:NSYSU/oai:NSYSU:etd-0725105-170403
Date25 July 2005
CreatorsLo, Yu-Chieh
ContributorsShin-Pon Ju, Shih-Jye Sun, Jin-Yuan Hsieh, Jenn-Sen Lin
PublisherNSYSU
Source SetsNSYSU Electronic Thesis and Dissertation Archive
LanguageCholon
Detected LanguageEnglish
Typetext
Formatapplication/pdf
Sourcehttp://etd.lib.nsysu.edu.tw/ETD-db/ETD-search/view_etd?URN=etd-0725105-170403
Rightsunrestricted, Copyright information available at source archive

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